Electrode holder



July 27, 1943. L HAKKI 2,325,394

' ELECTRODE HOLDER Filed June 13, 1942 Patented July`27, 1943 `'ELiiotriaopE HOLDER" l ,l Ismail'narkrNew Yoran. Y. v j j Application June 13, 1942;` Serial No. 4462947l 'j aoiaims. rc1.;1re-LimiA Thisinvention relates to new and useful'impro'vements in supporting elements,4 primarily for members which are` generally cylindrical in shape, and relates moreparticularly to anv improved support* for Vcarbon or other electrodes generally, especially in connection with 4an `arc lamp in a motion*I picture projector.

Supporting devices of this general character have been objectionablek orthe reasonthat their effective life has vbeen short,'due largely vto the heat generated inthe lamp, and also'to the rough handling on` the part of the operator. `Difficulty vhas also been experienced infproviding `a socketlike structure which will give adequate and rigid support to the electrode and will also permit the us'edlelectr-ode to be' removedi and quickly replaced with a freshone.

Itiisone of the principal objects of the present invention to provide a vsupport of this type which firmly Supports the electrode, which permits simple and' rapid replacement of the electrode,` and which will have a relativelylong .life of effective operation, particularly as compared with exist-v ing devices.

A further object of the inw/ennemis to provide a carbon support which will effect a very considerable saving of the carbon.

Another object of the present invention is to provide a carbon electrode support formed in a plurality of complemental jaw sections which are connected at their lower terminals and which have a suitably formed recess at their upper ends to receive the electrode, the device being free from split clamping bands, easily breakable car` bon supportingr fingers, and other objectionable elements which have been of the art. l

In the drawing:

Fig. 1 is a front elevation of the preferred embodiment of the present invention.

Fig. 2 is a side elevation thereof taken at an angle of 90 to that shown in Fig. 1.

Fig. 3 is a broken vertical section of the structure shown in Figs. 1 and 2.

Fig. 4 is a transverse section taken on the line 4-4 of Fig. 1. 1

Fig. 5 is similar to Fig. 4 but shows the retaining ring having been rotated 99 `from the posi-y tion shown injFig. 4.

Fig. 6 is a section taken on the line 6-'6 of Fig. 1. v j v Fig. 7 is a broken section through Va modied form of the invention.

Thepreferred embodiment of the present inpresent in the devices includes a plurality of complemental jaw sections I0 andk I I lwhichare similarly shaped. Each section includesa shank portion l2 which is generally semi-circular-in transverse section and vis provided with a flattened lower endportion I3 which receives one terminal of a substantially i U shaped connecting member l5 formed preferably of flat spring steel and riveted as at I6 to the shank. v i i Adjacent to but spaced from the upper end of ,i each section is an enlarged collar portion AI'I and afurther enlarged portion' I8 immediately above lar portions I'I,` such ring being supported onV collar portion I'I.` Theiouter surface of portion I8 may be knurled or otherwise rendered nonsmooth as shown at I9, since it" forms a finger engaging portion.

A recess 22 is formed atithe upper end oi portion I8 and when the two sections are assemy bled; as particularly shown in Fig.` 3, a circular recess is formed to receive the lower terminal of the' carbonelectrode 23. The diameter ofthe complemental recesses 22 is such that the two sections are in spaced relationship whenthe carbon is inserted therein.

A knurled retaining ring 24 is carried on cola pin 25 passing through the two sections. This pin may be formed in a single piece as shown in Fig. 3, or it may comprise a plurality of sections as shown in Fig. 1. If it is formed as shown inv Fig. 3, one terminal isY preferably secured against movement out of its supporting aperture, andin case the pin is formed in two sections, both of such sections will be so secured.

Retaining ring 24 is formed with either a circular or an elliptically shaped aperture 26, the

, latter form being shown in Figs. 4 and 5. In this s sition the jaw sections I9 and II exert considervention is illustrated in Figs. 1 to 4 inclusive and 55 able pressure on the electrode and prevent its easy removal. The real compressive action on the electrode comes, however, from the clamping' p action of supporting members 28 and 29 which are formed with complemental recesses 30 which receive shank portions I2 therebetween. A screw 3I or other similar means retains members 28 and i 29 in supporting relationship.

It will accordingly be seen that when the electrode is inserted within the recess formed in the jaw sections I 0 and I I and ring 24 rotated, the electrode is initially secured therein, and that when the shanks are placed between members 28 and 29 or other supporting devices which are conventionally included in motion picture projectors, the electrode is firmly mounted. It may also be removed andA replaced with ease.

InFig. 5 the pin 25 is eliminated entirely and ring 24 employed for retaining the upper ends of the jaw sections in alignment.

The modified form of the invention shown in Fig. '7 includes jaw sections 34 and 35, section 34 having a horizontal aperture 3 5 supporting a pin 31 which isl suitably secured against movement.` The opposite end of the pin passes through an aligned aperture 38 of slightly llarger diameter than aperture 36. The other arrangements, in-

cluding the retaining ring 39, are the same as in the iirst embodiment of the invention.

The materials out of which the device ofthe present invention may be made are av matter of tween clamping elements associated with the projector, means connecting the lower terminals of the. sections, the upper ends of the shank portions having aligned aperturestherein, a pin positioned within said apertures and being secured in one choice, although it is preferred to form the same from metals which are not seriously affected by 'die high-temperatures to which the deviceis-sub- ,jected. VA distinctsavingin carbon is effected bya deviceconstructedin accordance with the @resent invention, it permits a greater portion-Of theentire stick to `be utilized than-the existingdev-ices of this general character.

It will be, readily apparent that many changes aiidmodiiicatioiis in, the embodiments Of the, invention illustrated and described maybe 'made without departing from the Yspirit of the invention jasdened'bvthe appendediclaims.y Also, it will a se obvious that the devices of the present invention may have a varietyof'uses in addition to those specically enumerated.

What l claim is: l Y

1. A carbon supporting device far motiOii. picture projectors comprising a. plurality of compiemeiital jaw Sections, hav-ins cempiemental recesses at their upper Gridst0-1eeiveaiid-siipp-ort ythe carbon, shank portions at; the lower ends. of

Said Sections. a substantially UV shapedfmember of such apertures, and a retaining ring carried adjacent to the upper terminals of-the jaw sections ``for retaining such sections in substantial meetingl engagement.

f 3.Axcarboyn electrode vsupporting device for motionlpict'u-re projec-tors or the like comprising a pluralityoiindividual jaw members formed with shanlrportions at their lower ends, means comprising a substantially U shaped element vformed of iiat metal connectingthe lower terminals-of theusiiank portions. to permit movement of the jaw members relative to each other, each of said jawmembers having complemental recesses eX- tendingdovfnwardly'from their upper terminals and forming a seatat their lower ends for the lower terminal of the electrode, and-means for retaining jawH members insubstantial meeting engagement comprising a retaining ring, having an elliptically-shaped aperture therein, carried on the exterior of the several members, and a support for such ring comprising a pin extendfing outwardly frornthe members. 

